Optimal control for suppressing wave-packet spreading with strong nonresonant laser pulses

Yukiyoshi Ohtsuki, Tomotaro Namba, Hiroyuki Katsuki, Kenji Ohmori

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We use nonlinear optimal control simulation to systematically examine how to suppress wave-packet spreading with strong nonresonant near-infrared (NIR) laser pulses through a case study of a vibrational wave packet in the B state of I2. As the degree of spreading of the vibrational wave packet is controllable by adjusting the pump pulse shape, the vibrational wave packet may be regarded as a prototype system to study spreading suppression by using nonresonant laser pulses. We quantitatively define spreading suppression in terms of the probability of finding the wave packet in the analytically defined, initially excited state at every vibrational period. From optimal control simulation and simulation by using model Gaussian pulse trains that mimic optimal pulses, we conclude that a simple periodic NIR pulse train without highly tuned temporal widths, amplitudes, or irradiation timings can almost perfectly stop the wave-packet spreading over a long control period, provided that the degree of spreading is not too large.

Original languageEnglish
Article number033107
JournalPhysical Review A
Issue number3
Publication statusPublished - 2021 Sep

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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